Disclosed is a feed for fish farming which has a high stability in feed supply, good feed storage properties, a good feed intake and a high feed efficiency. A feed for fish farming consisting of an outer layer and an inner layer, characterized in that a composition constituting the outer layer has physical properties of a fracture stress being 5Ã 104-1Ã 106 N/m2, an aggregation rate (30%) being 0.4-1.0, and a fracture strain being 30-80%. A feed for fish farming characterized by consisting of an outer layer constructed by a heated gel which comprises a protein and/or a starch, and an inner layer comprising a composition which contains nutrient ingredients including fish meal and a fat as the essential ingredients. As the protein, ground fish meat, nakaochi (left-over fish meat on the spine), krill, gelatin, collagen, gluten, egg albumen and soybean protein are preferred. As the starch, tapioca starch, wheat starch, potato starch, corn starch, bean starch, waxy corn starch and processed products of these starches are preferred.Se describe un alimento para piscicultura que tiene alta estabilidad en suministro de alimento, buenas propiedades de almacenamiento del alimento, buen insumo de alimentos, y una alta eficiencia de alimento. Un alimento para piscicultura consiste de una capa exterior y una capa interior, caracterizadas en que una composición que constituye la capa exterior tiene propiedades físicas de una resistencia a la ruptura de 5 X 104 a 1 X 106 N/m2, una cohesión (30%) de 0.4 a 1.0, y una resistencia a la deformación de 30 a 80%. Un alimento para piscicultura caracterizado porque consiste de una capa exterior construida de un gel inducido por calor que comprende una proteína y/o un almidón, y una capa interior que comprende una composición que contiene ingredientes nutrientes que tienen carne de pescado y un aceite como ingredientes esenciales. Como la proteína, surimi, carne de pescado molida, krill, gelatina, colágeno, gluten, albúmina de huevo, y prote
